Barely visible impact damage assessment in laminated composites using acoustic emission

Milad Saeedifar, Mehdi Ahmadi Najafabadi, Dimitrios Zarouchas, Hossein Hosseini Toudeshky, Meisam Jalalvand

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)
20 Downloads (Pure)


Despite the key advantages of Fiber Reinforced Polymer (FRP) composites, they are susceptible to Barely Visible Impact Damage (BVID) under transverse loadings. This study investigates BVID in two quasi-isotropic carbon/epoxy laminates under quasi-static indentation and Low-Velocity Impact (LVI) loadings using Acoustic Emission (AE). First, the evolution of interlaminar and intralaminar damages is studied by analyzing the AE signals of the indentation test using b-value and sentry function methods. Then, the specimens are subjected to the LVI loading and the induced damages are compared with the indentation test and the percentage of each damage mechanism is calculated using Wavelet Packet Transform (WPT). In consistent with the mechanical data, ultrasonic C-scan and digital camera images of the specimens, the AE results show a considerable similarity between the induced BVID under quasi-static indentation and LVI tests. Finally, the obtained results show that AE is a powerful tool to study BVID in laminated composites under quasi-static and dynamic transverse loadings.

Original languageEnglish
Pages (from-to)180-192
Number of pages13
JournalComposites Part B: Engineering
Early online date11 Jul 2018
Publication statusPublished - 1 Nov 2018


  • acoustic emission
  • B-value
  • barely visible impact damage
  • indentation
  • laminated composites
  • low-velocity impact
  • sentry function
  • wavelet packet transform

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